I am going to ask about a few different synthetic items in this one post. Sorry if its been posted before buy things change and new items come out.
#1. Favorite synthetic lightweight vest?
#2. Favorite synthetic lightweight jacket?
#3. Do they make synthetic lightweight booties?

#1: REI Revelcloud Vest. Not really any better (or worse) than any other Primaloft synthetic vest on the market, but it does come cheaply: REI frequently marks these down to $70 or $50 depending on when you buy and what colors you can tolerate. The pockets are excellent and I like the snug fit around the arms for the arm holes.

#2: Patagonia Nano Puff Hoody. As a hiker this thing rocks. It is highly wind-resistant, layers well under things, and best of all, is hooded. I also have the FA Accelerant (too cold), Arcteryx Atom LT (sides aren't windproof) and Patagonia Micro Puff (too warm) and the Nano Puff is my go-to layer for my 3-season backpacking needs. Rock and ice climbing on the other hand, is when those other shells get to come out and play.

I'm in the same boat. It is a great hoodie but I really only use it for urban, late fall-early spring city use. I rarely take it into the mountains. For 1LB one can find a warm/waterproof system much more adaptable than a single jacket.

p.s. – I own it now but have owned it while living in NewEngland. Not much has changed even though my local has.

The rab xenon has been a great piece for me going on almost two years. Its not as warm as it once was and its held together by gorilla tape at this point, but I'd still say its warm enough for what I use it for (summer backpacking, bc skiing, rock/ice climbing–intermediate layer)

Its a very warm and weatherproof jacket for the weight, especially when it was new. The newer version of the xenon ads a couple oz, so consider looking for the discontinued model.

If I were getting a synthetic piece today it'd be the arc teryx nuclei hoody or the mountain hardwear thermostatic hoody (fall 13 model), both about 10oz. Tried both on, and I'm confident either would suit my purposes well. The arc teryx especially with the non-stitchthrough design (better wind resistance). Wonder how the shell material compares to the xenon.

For a three season synthetic piece, I think a 60gram primaloft hoody around 10-11, is a good bet. I have a lightweight, but much warmer down hoody that I can pair it with when it gets truly cold.

1. ArcTeryx Atom vest. I think of a synthetic vest as something to wear on the move, so I don't mind the non-insulated sides. Plus, I got it on sale.

2. First Ascent Igniter. It lists at 14 oz (and I can't remember what I weighed my older version at, maybe 15 oz) but for a few extra ounces in weight, you bump up to 100g of Primaloft 1. Also found this on sale as EB seems to have good annual sales, often including FA stuff. For warm-weather / 3 season, though, I'm more likely to use down.

I've got the Atom LT vest and like it. If you catch it on sale I'd sale its definitely worth it. Its probably not as warm as some other vests since it has the stretchy side panels but if you're moving the extra breathability is nice.

Right now I've just got a Thru-hiker Kinsman jacket with 1.8oz Primaloft. Its very loose fitting for layering and is really warm, but its definitely not something I'd wear around town. It weighs 10.8 ounces but has no pockets and I wish it had a hood. I've tried on a Nanopuff and didn't like the fit so I'm still searching. The Arcteryx Atom LT and Nuclei and OR Halogen all look intriguing.

My #2 is a Mountain Hardwear Compressor PL jacket. Fairly light weight, warm, and has a great cut.
Unfortunately, MH makes the current Compressor out of their proprietary 'Thermal Q' insulation. You can still find the older Primaloft versions on eBay / Gear Swap from time to time though.

I like my Mountain Hardwear Compressor Primaloft (100g) jacket as well. Cut the shockcord off from neck and waist so my small weighs 350g/12.35oz. I'd love a lighter, hooded version but they're so expensive. But i figure, if it's cold enough to need an integrated hood, a lighter jacket (say, 60g) probably won't be enough insulation.